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        Spring项目Ajax请求跨域问题解决
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    <h2 id="什么是跨域"><a href="#什么是跨域" class="headerlink" title="什么是跨域"></a>什么是跨域</h2><p>简单的说即为浏览器限制访问A站点下的js代码对B站点下的url进行ajax请求。比如说，前端域名是<code>www.abc.com</code>，那么在当前环境中运行的js代码，出于安全考虑，访问<code>www.xyz.com</code>域名下的资源，是受到限制的。现代浏览器默认都会基于安全原因而阻止跨域的ajax请求，这是现代浏览器中必备的功能。</p>
<h2 id="解决办法"><a href="#解决办法" class="headerlink" title="解决办法"></a>解决办法</h2><p>有根据spring的版本不同有不同的解决办法：</p>
<ol>
<li><p>在spring的4.2版本以后支持CORS（跨域资源共享），只需要在类或者方法上加入<code>@CrossOrigin</code>注解来实现：</p>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@CrossOrigin</span>(origins = <span class="string">"http://www,xxx.com"</span>;, maxAge = <span class="number">3600</span>) </span><br><span class="line"> </span><br><span class="line"><span class="meta">@RestController</span> <span class="meta">@RequestMapping</span>(<span class="string">"/account"</span>) </span><br><span class="line"> </span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AccountController</span> </span>&#123;</span><br><span class="line"> </span><br><span class="line">    <span class="meta">@RequestMapping</span>(<span class="string">"/&#123;id&#125;"</span>) </span><br><span class="line"> </span><br><span class="line">    <span class="function"><span class="keyword">public</span> Account <span class="title">retrieve</span><span class="params">(@PathVariable Long id)</span> </span>&#123; <span class="comment">// ... &#125;</span></span><br><span class="line"> </span><br><span class="line">    <span class="meta">@RequestMapping</span>(method = RequestMethod.DELETE, path = <span class="string">"/&#123;id&#125;"</span>)</span><br><span class="line"> </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">remove</span><span class="params">(@PathVariable Long id)</span> </span>&#123; <span class="comment">// ... &#125; </span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p> <code>maxAge</code> 表明在3600秒内，不需要再发送预检验请求，添加<code>@CrossOrigin</code>注解后，不需要在ajax请求上有任何改动即可正常发出请求接收数据。</p>
<p> 在Spring4.2中除了在controller的类或方法上设置外，还可以设置全局配置：</p>
<ol>
<li>定义一个继承自WebMvcConfigurerAdapter的类 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CorsConfigurerAdapter</span> <span class="keyword">extends</span> <span class="title">WebMvcConfigurerAdapter</span></span>&#123;</span><br><span class="line">     <span class="meta">@Override</span> </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">addCorsMappings</span><span class="params">(CorsRegistry registry)</span> </span>&#123; </span><br><span class="line">        registry.addMapping(<span class="string">"/api/*"</span>).allowedOrigins(<span class="string">"*"</span>).allowedMethods(<span class="string">"GET"</span>, <span class="string">"PUT"</span>, <span class="string">"DELETE"</span>, <span class="string">"POST"</span>);  </span><br><span class="line">    &#125; </span><br><span class="line"> </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ol start="2">
<li>将该类注入到容器中<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">"com.lemo.web.config.CorsConfigurerAdapter"</span>&gt;</span><span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
</ol>
</li>
</ol>
</li>
<li><p>在spring的4.2版本之前，可以通过自定义一个拦截器，给请求加上相应的相应头来处理</p>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Component</span></span><br><span class="line"> <span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyCorsFilter</span> <span class="keyword">implements</span> <span class="title">Filter</span> </span>&#123;</span><br><span class="line"> </span><br><span class="line">   <span class="meta">@Override</span></span><br><span class="line">   <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(FilterConfig filterConfig)</span> <span class="keyword">throws</span> ServletException </span>&#123;&#125;</span><br><span class="line"> </span><br><span class="line">   <span class="meta">@Override</span></span><br><span class="line">   <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">doFilter</span><span class="params">(ServletRequest servletRequest, ServletResponse    servletResponse, FilterChain filterChain)</span> <span class="keyword">throws</span> IOException, ServletException </span>&#123;</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     HttpServletResponse response = (HttpServletResponse) servletResponse;</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     String origin = (String) servletRequest.getRemoteHost()+<span class="string">":"</span>+servletRequest.getRemotePort();</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     response.setHeader(<span class="string">"Access-Control-Allow-Origin"</span>, <span class="string">"*"</span>); <span class="comment">//表明它允许任意连接发起跨域请求，*表示所有网站，可以把*替换为具体的网站</span></span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     response.setHeader(<span class="string">"Access-Control-Allow-Methods"</span>, <span class="string">"POST, GET, OPTIONS, DELETE"</span>); <span class="comment">//表明它允许GET、POST、OPTIONS、DELETE的外域请求</span></span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     response.setHeader(<span class="string">"Access-Control-Max-Age"</span>, <span class="string">"3600"</span>); <span class="comment">//表明在3600秒内，不需要再发送预检验请求</span></span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     response.setHeader(<span class="string">"Access-Control-Allow-Headers"</span>, <span class="string">"x-requested-with,Authorization"</span>); <span class="comment">//表明它允许跨域请求包含content-type头</span></span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     response.setHeader(<span class="string">"Access-Control-Allow-Credentials"</span>,<span class="string">"true"</span>); <span class="comment">//设置跨域ajax请求时是否带cookie的设置</span></span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line">     filterChain.doFilter(servletRequest, servletResponse);</span><br><span class="line">   &#125;</span><br><span class="line"> </span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">destroy</span><span class="params">()</span> </span>&#123;&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>在<code>web.xml</code>中配置使拦截器生效，配置完后即可生效</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">filter</span>&gt;</span></span><br><span class="line"> </span><br><span class="line">  <span class="tag">&lt;<span class="name">filter-name</span>&gt;</span>cors<span class="tag">&lt;/<span class="name">filter-name</span>&gt;</span></span><br><span class="line"> </span><br><span class="line">  <span class="tag">&lt;<span class="name">filter-class</span>&gt;</span>com.leimo.filter.myeCORSFilter<span class="tag">&lt;/<span class="name">filter-class</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">filter</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">filter-mapping</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">filter-name</span>&gt;</span>cors<span class="tag">&lt;/<span class="name">filter-name</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">url-pattern</span>&gt;</span>/*<span class="tag">&lt;/<span class="name">url-pattern</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">filter-mapping</span>&gt;</span></span><br></pre></td></tr></table></figure></li>
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